Friction-clutch.



No. 760,616. PATENTED MAY 24, 1904. H. BAUMGARTNER & J. ZIEGLER.

FRICTION CLUTCH. APPLIOATION FILED Nov. 9, 1901.

N0 MODEL.

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s Pntns co, PHOTO-LYING. wAsmN UNITED STATES Patented May 24, 1904.

PATENT OFFICE.

FRICTION-CLUTCH.

SPECIFICATION forming part of Letters Patent No. 760,516, dated May 24,1904.

Y Application filed November 9, 1901. Serial No. 81,779. (No model.)

To all whom it may concern:

Be it known that we, HUGO BAUMGARTNER and J ULES ZIEGLER, citizens ofSwitzerland, residing at Basle, Switzerland, have invented certain newand useful Improvements in Friction-Clutches, of which the following isa specification.

This invention relates to friction-clutches; and it has for its objectto provide a construction wherein the clutch-shoes may be operated withan expenditure of a minimum of energy with a maximum gripping effect,other objects and advantages of the invention being evident from thefollowing description.

In the drawings forming a portion of this specification, and in whichlike characters of reference indicate similar parts in both views,Figure 1 is a front elevation of a clutch mechanism embodying thepresent invention, the lower half of the casingbeing in place and theupper half of the tapered sleeve and the hub of the inner wheel being invertical section. Fig. 2 is a view showing the upper half of the clutchmechanism in vertical section and the lower half in side elevation.

Referring now to the drawings, there are shown two shafts a and a,'ofwhich the former is the driving-shaft and the latter the driven shaft.Upon the driving-shaft a is mounted fixedly the hub b of a wheelcomprising the web 5 and the laterally-directed flange 6 at the outeredge of the latter and which encircles and is concentric to the shaft(0. The inner face of the flange 6 is corrugated transversely, as shownat 7, to give a better gripping-surface, and these corrugations are inthe form of inwardly-directed cross-sectionally triangular ribs. Mountedupon the driven shaft a and held thereon against rotation by the splinek is the hub c of what may be termed a second wheel, including a web 0.Upon the web 0 at the opposite side from the web 5 is a series ofsleeves d, in each of which is slidably mounted the stem 8 of abrake-shoe c of are shape and the outer face of which is corrugated tomesh with the corrugated inner face of the flange 6, so that when thebrake-shoes are forced outwardly into close contact with the flange 6they will hold to the flange by friction, and thus lock the inner clutchmember on the shaft a to rotate with the outer clutch member on theshaft a.

The stems 8 of the clutch-shoes are socketed to slidably receiveplungers f, having eccentrically-mounted rollers 72 in their lower endsand above which are shoulders g. A.

helical spring 2' is disposed upon each of the plungers between theshoulder g and the stem of the corresponding brake-shoe, so that whenthe plungers are forced radially to move the brake-shoes into engagementwith the flange 6 the springs 2' may be slightly compressed, so thatthere will not be a too sudden gripping of the brake-shoes, a furtherobject of the springs being presently explained.

To move the plungers outwardly. a tapered sleeve Z is provided and isslidably mounted upon the shaft a, upon which it is held againstrotation by the spline 7n, and this sleeve is adapted to be forcedbetween the hub c and the eccentric rollers, during which movement therollers are rotated, and as they move up the inclined face of the sleevethey are pressed outwardly to correspondingly move the plungers and thebrake-shoes. In the movement of the sleeve the spring 2' is compressedafter engagement of the brake-shoe, and in the sleeve are depressions Zone for each of the rollers it, and which are so positioned that whenproper pressure has been applied to the springs the rollers will enterthe depressions and remain therein until the sleeve is forcibly moved inthe opposite direction. Thus is the clutch held against accidentaldisplacement of the parts such as would release the mechanism.

To prevent outward movement of the cl utchshoes by centrifugal force,helical springs 0 are connected to the shoes and to lugs upon thesleeves a, as illustrated, the tension of these springs being such as toovercome any centrifugal tendency, while not interfering in any markeddegree with the operation of the clutch mechanism.

What is claimed is 1. In a clutch mechanism, the combination with aclutch-shoe, of a plunger slidably engaged therewith, a spring betweenthe plunger and shoe for transmitting energy from the former to thelatter, and a wedge disposed for engagement with the plunger to forcethe latter outwardly and operate the shoe, said wedge having adepression to receive the plunger when the shoe is in active position.

2. In a clutch mechanism, the combination with a member having aclutch-face, of a second member having sleeves thereon, clutchshoeshaving stems slidably mounted in the sleeves, said stems having sockets,plungers slidably engaged in the sockets of the stems, springs disposedbetween the plungers and stems to transmit energy from the former to thelatter, and a tapered sleeve disposed for movement between the severalplungers to force them outwardly and compress the springs to actuate theshoes, said sleeve having recesses to receive the plungers when theshoes are in active positions.

3. In a clutch mechanism, the combination with a member having aclutch-face, of a sec- 0nd member having sleeves thereon, clutchshoeshaving stems slidably mounted in the sleeves, said stems having sockets,plungers slidably engaged in the sockets of the stems, springs disposedbetween the plungers and stems to transmit energy from the former to thelatter, and rolls eccentric to their axles carried by the plungers anddisposed for movement upon a tapered sleeve which is movable axiallyupon the driven disk, said sleeve having recesses to receive the rollswhen the brakeshoes are in active positions.

In testimony whereof we have hereunto set our hands in the presence oftwo witnesses.

HUGO BAUMGARTNER. JULES ZIEGLER.

Witnesses:

GEORGE GIFFORD, H. BALLIGER.

